I have Mac Pro 2010 with MacOS High Sierra and with the original “ATI Radeon HD 5870” video card.
I have been using it with old Philips Display connected using DVI-DVI cable.
I recently purchased Dell U2719d and having trouble getting it work.
I have tried connecting the Mac with either Mini-display to Display and with Mini-Display to HDMI cables and get the same behaviour.
When the new Dell monitor is connected and I start the Mac, the display stays black and I get message “No signal from the Display Port”. However if I boot the Mac with my old Philips monitor and then connect the new Dell after login, it works perfectly well and is recognised by the Mac. It continues to work ok even if I then disconnect the old monitor, however if I reboot the Mac with only the Dell monitor, I get again “No signal”.
Any ideas of what is the issue and how to fix it? I hope you can help me.
I have been using it with old Philips Display connected using DVI-DVI cable.
I recently purchased Dell U2719d and having trouble getting it work.
I have tried connecting the Mac with either Mini-display to Display and with Mini-Display to HDMI cables and get the same behaviour.
When the new Dell monitor is connected and I start the Mac, the display stays black and I get message “No signal from the Display Port”. However if I boot the Mac with my old Philips monitor and then connect the new Dell after login, it works perfectly well and is recognised by the Mac. It continues to work ok even if I then disconnect the old monitor, however if I reboot the Mac with only the Dell monitor, I get again “No signal”.
Any ideas of what is the issue and how to fix it? I hope you can help me.